package com.linxin.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.IdWorker;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.linxin.reggie.common.BaseContext;
import com.linxin.reggie.common.CustomException;
import com.linxin.reggie.entity.*;
import com.linxin.reggie.mapper.OrderMapper;
import com.linxin.reggie.service.*;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;

@Slf4j
@Service
public class OrderServiceImpl extends ServiceImpl<OrderMapper, Orders> implements OrderService {

    @Autowired
    private ShoppingCartService shoppingCartService;
    @Autowired
    private UserService userService;
    @Autowired
    private AddressBookService addressBookService;
    @Autowired
    private OrderDetailService orderDetailService;

    /**
     * 用户下单
     *
     * @param orders
     */
    @Transactional // 操作多张表
    @Override
    public void submit(Orders orders) {
        // 1. 获取当前用户的id
        Long userId = BaseContext.getCurrentId();

        // 2. 查询用户购物车的数据
        LambdaQueryWrapper<ShoppingCart> shoppingCartLambdaQueryWrapper = new LambdaQueryWrapper<>();
        // 等值查询
        shoppingCartLambdaQueryWrapper.eq(ShoppingCart::getUserId, userId);
        // 获取数据(可能为多条)
        List<ShoppingCart> shoppingCarts = shoppingCartService.list(shoppingCartLambdaQueryWrapper);
        // 判断购物车是否为空, 为空抛出自定义异常
        if (shoppingCarts == null || shoppingCarts.size() == 0) {
            throw new CustomException("购物车为空, 不能下单!!!");
        }

        // 查询用户数据
        User user = userService.getById(userId);

        // 查询地址数据
        Long addressBookId = orders.getAddressBookId();
        AddressBook addressBook = addressBookService.getById(addressBookId);
        // 判断地址是否为空, 为空不能下单
        if (addressBook == null) {
            throw new CustomException("地址为空, 不能下单!!!");
        }

        // 3. 向订单表插入一条数据, 需要补充orders的属性, 前端传入的不够
        // 生成订单号
        long orderId = IdWorker.getId();
        // 设置orders的属性

        // 对总金额的累加, 使用AtomicInteger保证在多线程的情况下不会出现运算错误
        AtomicInteger amount = new AtomicInteger(0);

        // 设置orderDetail的其他属性, 可能为多个
        List<OrderDetail> orderDetails = shoppingCarts.stream().map((item) -> {
            OrderDetail orderDetail = new OrderDetail();
            orderDetail.setOrderId(orderId);
            orderDetail.setNumber(item.getNumber());
            orderDetail.setDishFlavor(item.getDishFlavor());
            orderDetail.setDishId(item.getDishId());
            orderDetail.setSetmealId(item.getSetmealId());
            orderDetail.setName(item.getName());
            orderDetail.setImage(item.getImage());
            orderDetail.setAmount(item.getAmount());
            amount.addAndGet(item.getAmount().multiply(new BigDecimal(item.getNumber())).intValue());
            return orderDetail;
        }).collect(Collectors.toList());

        // 设置orders其他属性
        orders.setId(orderId);
        orders.setOrderTime(LocalDateTime.now());
        orders.setCheckoutTime(LocalDateTime.now());
        orders.setStatus(2);
        orders.setAmount(new BigDecimal(amount.get()));//总金额
        orders.setUserId(userId);
        orders.setNumber(String.valueOf(orderId));
        orders.setUserName(user.getName());
        orders.setConsignee(addressBook.getConsignee());
        orders.setPhone(addressBook.getPhone());
        orders.setAddress((addressBook.getProvinceName() == null ? "" : addressBook.getProvinceName())
                + (addressBook.getCityName() == null ? "" : addressBook.getCityName())
                + (addressBook.getDistrictName() == null ? "" : addressBook.getDistrictName())
                + (addressBook.getDetail() == null ? "" : addressBook.getDetail()));
        //向订单表插入数据，一条数据
        this.save(orders);

        // 4. 向订单明细表插入数据, 可能是多条数据
        orderDetailService.saveBatch(orderDetails);

        // 6. 清空购物车数据
        shoppingCartService.remove(shoppingCartLambdaQueryWrapper);
    }

    /**
     * 用户界面查询
     * @param orderId
     * @return
     */
    @Override
    public List<OrderDetail> getOrderDetailListByOrderId(Long orderId) {
        LambdaQueryWrapper<OrderDetail> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(OrderDetail::getOrderId, orderId);
        //根据order表的条件查询出order_detail的数据，因为一个订单可能有多条菜品数据
        List<OrderDetail> orderDetailList = orderDetailService.list(queryWrapper);
        return orderDetailList;
    }
}
